CN220665951U - UHPC-NC composite beam system based on CFRP prestressed tendons - Google Patents
UHPC-NC composite beam system based on CFRP prestressed tendons Download PDFInfo
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- CN220665951U CN220665951U CN202321438292.8U CN202321438292U CN220665951U CN 220665951 U CN220665951 U CN 220665951U CN 202321438292 U CN202321438292 U CN 202321438292U CN 220665951 U CN220665951 U CN 220665951U
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- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 12
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 5
- 239000004917 carbon fiber Substances 0.000 claims abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011208 reinforced composite material Substances 0.000 claims abstract description 5
- 238000011065 in-situ storage Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
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Abstract
The utility model discloses a UHPC-NC composite beam system based on CFRP prestressed tendons, which comprises the following components: the beam body in the tension zone is an ultra-high performance concrete beam prepared based on the principle of minimum bulk density, namely a UHPC beam; the prestressed tendons are arranged along the length direction of the beam body of the tension zone and are positioned at the top and the bottom of the beam body of the tension zone, and the prestressed tendons are CFRP tendons made of carbon fiber reinforced composite materials constructed by adopting a pretensioning method; and the bridge deck slab is cast in situ or prefabricated, and is connected with the tension zone beam body by adopting shear ribs. The utility model fully utilizes the high tensile strength and the high compressive strength of the UHPC material and the CFRP material to ensure that the UHPC material and the CFRP material reach the limit state together, has good deformability, and solves the problem of the grip-ability of the prestressed tendons. The structure has the advantages of excellent stress, high bonding strength, simplified construction, energy conservation and emission reduction.
Description
Technical Field
The utility model particularly relates to a UHPC-NC composite beam system based on CFRP prestressing tendons.
Background
At present, the ultra-high performance concrete has become a novel building material with great application prospect in the civil engineering field. The prestress web-free rib UHPC-NC composite beam fully utilizes the shearing resistance of the UHPC matrix, meets the requirement of crack resistance by setting prestress, and achieves the characteristics of light weight and convenient construction by adopting the web-free rib design. The UHPC ultrahigh compressive strength can better exert the effect of prestressing force, and is beneficial to design and construction of lighter and high-strength structures. The UHPC has higher material price, the material performance is fully utilized in the structural design, and the cross section size is reduced as much as possible so as to realize economy. The high tensile strength provided by the web-free UHPC-NC beam through the baseboard prestress beam provides bending and pulling performance, and the number and the tensile force of the prestress ribs are determined by the bending resistance bearing capacity and the structural ductility of the section. UHPC is used as a durability protection material for the prestress beam, and the size of the bottom plate of the beam body is determined by the arrangement of the steel beam. The prestress beam is usually made of steel strands or high-strength steel wires with relatively high tensile strength, the bottom plate is designed into a horseshoe shape, and the area of the bottom plate accounts for more than 50% of the total cross-sectional area, so that compared with a conventional concrete structure, the prestress UHPC-NC composite beam without the web bars has no advantage in economy, and the popularization difficulty is high. Meanwhile, the tensile strength of the steel strand is difficult to be matched with the ultrahigh compressive strength of UHPC, the compressive strength of UHPC is not fully utilized, and the bending test is often in a brittle failure state of broken prestressed tendons. If a novel building material with higher tensile strength can be used as the prestress of the composite beam, a UHPC structure with better cost performance and stress can be developed.
The CFRP of the carbon fiber reinforced composite material has the advantages of light weight, high specific strength, high specific modulus, corrosion resistance, fatigue resistance, easiness in construction and the like, and particularly, the tensile strength can be more than 1.5 times of that of a conventional steel strand, and the CFRP can be considered as an ideal material for a prestressed tendon of a concrete structure. However, the plastic residual deformation reflecting the structural ductility in the CFRP reinforced concrete structure is smaller than that of the ordinary concrete structure, the ductility performance of the CFRP reinforced concrete structure mainly depends on the plasticity of the concrete, the ductility of the conventional CFRP reinforced concrete structure is poor, and the bonding strength is reduced along with the increase of the diameter of the CFRP rib.
Disclosure of Invention
The utility model aims to provide a UHPC-NC composite beam system based on CFRP prestressed tendons, which fully utilizes the compression strength of UHPC and the tensile strength of CFRP tendons, overcomes the defects of poor ductility and insufficient bonding strength of CFRP reinforced concrete structure, and ensures that the UHPC-NC composite beam based on CFRP prestressed tendons is crushed by concrete in a flexural failure state, thereby improving the ductility and deformability.
The above object can be achieved by the following technical solutions.
A UHPC-NC composite beam system based on CFRP tendons, comprising:
the beam body in the tension zone is an ultra-high performance concrete beam prepared based on the principle of minimum bulk density, namely a UHPC beam;
the prestressed tendons are arranged along the length direction of the beam body of the tension zone and are positioned at the top and the bottom of the beam body of the tension zone, and the prestressed tendons are CFRP tendons made of carbon fiber reinforced composite materials constructed by adopting a pretensioning method;
and the bridge deck slab is cast in situ or prefabricated, and is connected with the tension zone beam body by adopting shear ribs.
The UHPC doped with a proper amount of steel fibers has higher ultimate tensile strength, peak strain and ultimate strain than ordinary concrete, and has important significance for improving the ductility of the CFRP reinforcement structure with concrete crush failure. The UHPC has excellent bonding and anchoring properties, and ensures the bond-wrapping property and durability of the connection with the CFRP rib with large diameter. Compared with the post-tensioning process, the pre-tensioning pre-stressing UHPC structure has the advantages of saving UHPC material, along with simple construction process, saving anchor, uniform stress and the like. For CFRP prestressed tendons, the pretensioning method not only can solve the problem of grip-ability, but also does not need special anchors, and has higher popularization value.
The utility model also has the following preferred designs:
the cross section of the tension zone beam body is any one of a pi-shaped beam, an I-shaped beam, a T-shaped beam and a U-shaped beam.
As a feasible implementation mode, the tension zone beam body adopts a pi-shaped beam or an I-shaped beam when the bridge span is smaller than 20m, the tension zone beam body adopts a T-shaped beam when the bridge span is between 20m and 30m, and the tension zone beam body adopts a U-shaped beam when the bridge span is larger than 30 m.
The prestressed tendons are the straight line bundles, the anchorage devices are not arranged, the prestressed tendons are CFRP tendons which adopt a pretensioning process, the CFRP tendons are small in transverse rigidity, the prestressed tendons are arranged into the straight line bundles, the construction is convenient, the problem of the gripping property of the CFRP tendons is effectively solved, the prestressed pipelines and the anchorage devices are not required to be arranged, the construction efficiency is improved, and meanwhile the uniform distribution of steel fibers is facilitated.
The UHPC of the high-strain hardening type high-performance concrete is adopted as the tension area beam body, the shearing resistance bearing capacity of the UHPC beam is borne by the UHPC matrix material of the web plate due to the strong bonding performance of the UHPC and the reinforcing steel bars, the high tensile strength, the high durability and the fatigue resistance before cracking of the UHPC material are applied, stirrups and common bending reinforcing steel bars can not be arranged in the middle part of the tension area beam body, namely the inside of the web plate, and the shearing force bars do not need to be in an overlong anchoring length. Therefore, the shear rib adopts an inverted U shape, has a simple structure, and can meet the requirements of shearing connection, wherein the shear rib is distributed according to the calculation result.
The construction method of the UHPC-NC composite beam system based on the CFRP prestressed tendons comprises the following steps:
s1, installing a prestressed tendon on a pedestal, and tensioning and anchoring;
s2, prefabricating a tension zone beam body, and reserving shearing force bars and hanging point steel bars before pouring the tension zone beam body;
s3, performing moisture preservation maintenance on the poured beam body in the tension area until the beam body reaches the design strength, and then releasing the prestressed tendons;
s4, carrying out high-temperature curing on the tension area Liang Tijin, wherein the total time of the high-temperature curing is more than or equal to 48 hours;
s5, hoisting the tension zone beam body to a construction site for connecting with a bridge deck to form a UHPC-NC combined beam system;
the tensioning stress of the prestressed tendons in the step S1 is designed according to the flexural failure state of the structure of the UHPC-NC composite beam to crush and destroy concrete.
In the step S5 of the present utility model, the tension zone beam body is post-cast on a construction site to form an end diaphragm.
The bridge deck of the utility model is a concrete bridge deck or a prefabricated bridge deck cast in place.
The utility model has the following beneficial effects:
1. the economic effect is good: the UHPC beam has higher material unit price, and the utility model utilizes the high tensile strength of the CFRP material on the basis of adopting the web-free design, reduces the material consumption of the bottom plate of the UHPC beam, realizes the light-weight design and is convenient for transportation and assembly. The pre-tensioning technology is adopted for construction, and pipelines and tensioning spaces are not required to be reserved, so that the cost performance of the UHPC structure is further improved.
2. The structural stress is excellent: the high tensile strength and the ultrahigh compressive strength of the UHPC material and the CFRP material are fully utilized, and the bending damage resistance state is the concrete crushing damage through reasonable design, so that the ductility and the deformability are good, and the durability is better.
3. The bonding strength is high: the bonding strength of the UHPC beam and the CFRP rib is greatly improved compared with that of common concrete, and the bonding property and durability of the connection of the UHPC and the CFRP rib with large diameter are ensured.
4. The durability is good: UHPC and CFRP materials are materials with better durability, and the composite beam is particularly suitable for being used in a high-corrosion environment.
5. And (3) construction is simplified: the steel bar engineering quantity is small, the construction is performed by a pretensioning method, the construction process is simplified, the anchor is saved, and grouting is not needed. The beam body in the tension zone can be manufactured in a factory manner, so that the quality is ensured.
6. Energy saving and emission reduction: the carbon emission of the web-free UHPC-NC composite beam is generally reduced by about 50-60% compared with that of a steel composite structure bridge, the structural section size is further reduced based on the CFRP prestressed web UHPC-NC composite beam, and the carbon emission generated in the production and maintenance processes is less, so that the composite beam is environment-friendly.
In summary, the UHPC-NC combined beam system based on the CFRP prestressing tendons is beneficial to industrialization, transportation light weight and construction assembly of manufacturing while realizing economy, and finally realizes industrial manufacturing. Has good economic and social benefits and wide application prospect, and is worth popularizing.
Drawings
FIG. 1 is a schematic diagram of an I-beam structure of a UHPC-NC composite beam system based on prestressed CFRP ribs;
FIG. 2 is a UHPC-NC composite beam system based on prestressed CFRP ribs of the present utility model; is a pi beam structure schematic diagram;
FIG. 3 is a schematic diagram of a T-beam structure of a UHPC-NC composite beam system based on prestressed CFRP ribs according to the present utility model;
fig. 4 is a schematic diagram of a U-shaped beam structure of a UHPC-NC composite beam system based on prestressed CFRP tendons according to the present utility model.
Reference numerals: 1-a tension zone beam body, 2-prestressed tendons, 3-bridge decks and 4-shearing tendons.
Detailed Description
The following surfaces are presented in conjunction with the drawings and examples to better understand and practice the technical solution of the present utility model by those of ordinary skill in the art.
As shown in fig. 1, a UHPC-NC composite beam system based on CFRP tendons includes:
the tension zone beam body 1 is an ultra-high performance concrete beam prepared based on the principle of minimum bulk density, namely an UHPC beam, the UHPC beam is prefabricated in a factory, and the minimum strength standard value is 130MPa;
the prestress ribs 2 are arranged along the length direction of the tension zone beam body 1 and are positioned at the top and the bottom in the tension zone beam body 1, the prestress ribs 2 are carbon fiber reinforced composite material CFRP ribs constructed by adopting a pretensioning method, and the clear distance is not less than 30mm;
the bridge deck 3 cast in situ or prefabricated is connected with the beam body 1 in the tension zone by shear bars 4.
As a preferred embodiment:
in this embodiment, the cross section of the tension zone beam body is an i-beam, and in other embodiments, the cross section of the tension zone beam body may be any one of a pi-beam, a T-beam, and a U-beam, see fig. 2 to 4.
Specifically, the tension zone beam body 1 preferably adopts a pi-shaped beam or an I-shaped beam when the bridge span is smaller than 20m, the tension zone beam body 1 preferably adopts a T-shaped beam when the bridge span is between 20m and 30m, and the tension zone beam body 1 preferably adopts a U-shaped beam when the bridge span is larger than 30 m.
The prestressed tendons 2 are straight wire bundles and are not provided with anchorage devices, because the prestressed tendons 2 are CFRP tendons adopting a pretensioning process, the CFRP tendons are small in transverse rigidity and are provided with the straight wire bundles, the construction is convenient, the problem of the gripping property of the CFRP tendons is effectively solved, the prestressed pipelines and the anchorage devices are not required to be arranged, the construction efficiency is improved, and meanwhile, the uniform distribution of steel fibers is facilitated. The prestress rib 2 is designed according to a full prestress component, the standard value of tensile strength is not less than 2300MPa, and the beam end is matched with the sleeve to set the failure length according to the requirement of a calculation result.
The UHPC of high strain hardening type high-performance concrete is adopted in the tension area beam body 1, the shearing resistance bearing capacity of the UHPC beam is borne by the UHPC matrix material of the web plate due to the strong bonding performance of the UHPC and the reinforcing steel bars, the high tensile strength, the high durability and the fatigue resistance before cracking of the UHPC material are applied, stirrups and common bent reinforcing steel bars can not be arranged in the middle part of the tension area beam body, namely the inside of the web plate, the shearing force ribs 4 do not need overlong anchoring lengths, the shearing force ribs 4 adopt inverted U-shaped structures, the structure is simple, and the shearing force ribs can meet the shearing connection requirements, and are distributed according to the calculation results.
The construction method of the UHPC-NC composite beam system based on the CFRP prestressed tendons comprises the following steps:
s1, splicing a steel template for pouring a tension zone beam body 1 on a pedestal, performing rust prevention treatment on the outer surface of the steel template, installing a prestressed tendon 2 on the pedestal, performing tensioning anchoring, wherein the prestressed tendon 2 adopts a straight wire bundle and cannot be bent, and setting the failure length of a beam end according to a calculation result;
s2, prefabricating a tension zone beam body 1, and reserving shearing force bars 4 and hanging point steel bars before pouring the tension zone beam body 1;
s3, after the poured tension zone beam body 1 is subjected to moisture preservation and maintenance to the design strength, the prestressed tendons 2 are subjected to tension release, and the tension release is symmetrically and uniformly completed in a dividing way;
s4, carrying out high-temperature curing on the tension zone beam body 1, wherein the total time of the high-temperature curing is more than or equal to 48 hours;
s5, hoisting the tension zone beam body 1 to a construction site for connecting with the bridge deck 3 to form a UHPC-NC combined beam system;
the tensioning stress of the tendon 2 in the step S1 is designed according to the flexural failure state of the structure of the UHPC-NC composite beam to crush and destroy concrete.
In step S5, the tension zone beam body 1 is post-cast on a construction site to form an end diaphragm.
The deck slab 3 is a concrete deck slab cast in place or a prefabricated deck slab. Bridge deck slabs are generally paved on site, and after reinforcing steel bars are bound, concrete bridge decks are cast on site, wherein the concrete label is C50 or more.
In the utility model, the tensioning stress of the prestressed tendons 2 needs to ensure that the flexural failure state of the structure is that concrete is crushed and destroyed.
The above embodiments are only preferred embodiments of the present utility model, but not limiting, and any modifications and improvements based on the concept of the present utility model should fall within the scope of the present utility model, and the specific scope of the present utility model is defined by the claims.
Claims (5)
1. The UHPC-NC composite beam system based on the CFRP prestressed tendons is characterized in that: comprising the following steps:
the beam body in the tension zone is an ultra-high performance concrete beam prepared based on the principle of minimum bulk density;
the prestressed tendons are arranged along the length direction of the beam body of the tension zone and are positioned at the top and the bottom of the beam body of the tension zone, and the prestressed tendons are CFRP tendons made of carbon fiber reinforced composite materials constructed by adopting a pretensioning method;
the tension zone beam body is made of high-strain hardening type high-performance concrete, and stirrups and common bending steel bars are not arranged in the middle part of the tension zone beam body, namely the inside of a web plate;
and the bridge deck slab is cast in situ or prefabricated, and is connected with the tension zone beam body by adopting shear ribs.
2. The UHPC-NC composite beam system based on CFRP tendons according to claim 1, wherein: the cross section of the tension zone beam body is any one of a pi-shaped beam, an I-shaped beam, a T-shaped beam and a U-shaped beam.
3. The UHPC-NC composite beam system based on CFRP tendons according to claim 2, wherein: the bridge span is smaller than 20m, the tension zone beam body adopts a pi-shaped beam or an I-shaped beam, the tension zone beam body adopts a T-shaped beam when the bridge span is between 20m and 30m, and the tension zone beam body adopts a U-shaped beam when the bridge span is larger than 30 m.
4. A UHPC-NC composite beam system based on CFRP tendons according to any one of claims 1 to 3, wherein: the prestress rib is a straight wire bundle, and an anchor is not arranged.
5. The UHPC-NC composite beam system based on CFRP prestressing tendons, according to claim 4, wherein: the shearing rib is inverted U-shaped.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321438292.8U CN220665951U (en) | 2023-06-07 | 2023-06-07 | UHPC-NC composite beam system based on CFRP prestressed tendons |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321438292.8U CN220665951U (en) | 2023-06-07 | 2023-06-07 | UHPC-NC composite beam system based on CFRP prestressed tendons |
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| CN220665951U true CN220665951U (en) | 2024-03-26 |
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| CN202321438292.8U Active CN220665951U (en) | 2023-06-07 | 2023-06-07 | UHPC-NC composite beam system based on CFRP prestressed tendons |
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2023
- 2023-06-07 CN CN202321438292.8U patent/CN220665951U/en active Active
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